Recognition of Car License Plate Using Geometric Information from Portable Device Image

휴대단말기 영상에서의 기하학적 정보를 이용한 차량 번호판 인식

  • 염희정 (경원대학교 일반대학원 전자계산학과) ;
  • 은성종 (경원대학교 일반대학원 전자계산학과) ;
  • 황보택근 (경원대학교 일반대학원 전자계산학과)
  • Received : 2010.06.07
  • Accepted : 2010.10.25
  • Published : 2010.10.28


Recently, the character image processing technology using portable device camera image at home and abroad are actively conducted, but Practical use are lower rate because of accuracy and time-consuming process problems. In this paper, we propose the license plate recognition method based on geometric information from portable device camera image. In the extracted license plate region we recognize characters using the chain code and the Thickness information through the cumulative projected edge after performing the pre-processing work considering the angle difference, the contrast enhancement and the low resolution from portable device camera image. The proposed algorithm is effective and accurate recognition by light and reducing the processing time. And, the results from the character recognition success rate was 95%. In the future, we will research about license plate recognition algorithm using long distance image or added motion blur image.


License Plate Recognition;Geometric Information;Portable Device Image


Supported by : 경원대학교


  1. 유성열, "유비쿼터스 기술 기반의 지능형 교통시설물관리서비스를 위한 비즈니스 모델", 한국컴퓨터정보학회, 제14권, 제12호, pp.41-53, 2009.
  2. Rafael C. Gonzalez, Richard E. Woods and Steven L. Eddins, Digital Image Processing Using Matlab, Prentice Hall, 2004.
  3. A. Conci, J. E. R. de Carvalho and T. W. Rauber, "A Complete System for Vehicle Plate Localization, Segmentation and Recognition in Real Life Scene," IEEE LATIN AMERICA TRANSACTIONS, Vol.7, No.5, 2009.
  4. Qian Cui, Suihe Ge, Shujian Shi and Lin Wang, "License Plate Location based on Direction and Edge Information," Second Asia-Pacific Conference on Computational Intelligence and Industrial Applications, 2009.
  5. Ching-Tang Hsieh, Liang-Chun Chang, Kuo-Ming Hung and Hsieh-Chang Huang, "A Real-time Mobile Vehicle License Plate Detection and Recognition for vehicle monitoring and management", Pervasive Computing (JCPC), 2009 Joint Conferences on, pp.197-202, 2009.
  6. 조보호, 정성환, "라돈 변환을 이용한 회전된 물체의 효율적인 보정", 정보과학회, 컴퓨팅의 실제 및 레터, 제14권, 제3호, pp.291-295, 2008.
  7. I. Siddiqi and N. Vincent, "A Set of Chain Code Based Features for Writer Recognition," ICDAR '09. 10th International Conference on Document Analysis and Recognition, pp.981-985, 2009.